iPhone web app authors rejoice! (Yes. You read that right. Web-app authors.) Test your web apps using the officialiPhone simulator. (And, oh yeah, you can go native now too...but the lack of RubyCocoa support is a bit of a downer.)

A plugin that lets you run Struts 1.x code inside a Grails app? Yeah, I cringed too, but this will surely be a welcome migration path for those folks trapped in the land of *.do.